#include <stdio.h>
//标准输出函数putchar
 
int main(int argc,const char * argv[])
{
 int ret;
 ret = putchar('a'); //输出单个字符
 putchar('b');
 putchar('c');
 putchar(10);//10是换行字符
 printf("ret = %d , ret = %c\n",ret,ret);
 return 0;
}